Heat insulation cover for stove and gas stove using the heat insulation cover

Abstract

The present invention relates to a heat insulation cover for stoves, comprising an annular cover body, a ring-shaped cavity is formed in the center of the cover body, the cover body is double-layered and has a cavity, and is characterized in that: the cover body is provided with air outlet holes connecting the annular cavity and the cavity at intervals along the circumferential direction on the inner side wall forming the annular cavity, and the cover body is provided with air inlet holes for external air to flow into the cavity on the outer side wall or the bottom wall. The present invention also provides a gas stove using the above-mentioned heat insulation cover for stoves, the gas stove can use a partition arranged on the heat insulation cover to independently supplement secondary air to the inner and outer rings, effectively avoiding the irrational distribution of secondary air such as excess secondary air in the inner ring and insufficient secondary air in the outer ring, and the secondary air is forced to be diverted by the partition so that the inner and outer rings can fully burn, which is particularly suitable for an outer ring fire cover with two rings of fire. The arrangement of the partition can avoid the mutual influence of secondary air between the inner ring and the outer ring.

Description

Technical Field

[0001] The invention relates to the field of gas stoves, and in particular to a stove heat insulation cover and a gas stove having the stove heat insulation cover. Background Art

[0002] At present, the prior art discloses a blast-type household gas stove burner, including a blower and a burner, but it is limited to limited supplementation of primary air during the combustion process, and cannot effectively supplement secondary air. The secondary air supplement completely depends on the adjustment of the burner outside. This adjustment is affected by the structure of the entire gas stove, and is prone to problems such as insufficient combustion, excessive CO in the flue gas, and low thermal efficiency. For this reason, a patent number of ZL201120141967.3 (authorization announcement number of 202109479U) discloses a blast-type household gas stove burner, including a controller, a blower and a burner. The burner includes a stove base, a flame distributor, an air distributor, a gas distributor, a conduit, an ejector mixing tube and a nozzle. The flame distributor has a combustion fire hole and a secondary air through hole. Through two air ducts connected to the blower outlet, one is connected to the burner nozzle installation position to supplement primary air, and the other is connected to the upper part of the burner to supplement secondary air. In this way, the primary air coefficient and the distribution of secondary air in the gas combustion process are directly controlled to ensure the uniformity of gas and air mixing. However, the secondary air of the gas stove burner is distributed to the ignition distributor more evenly, which is only suitable for burners with complete premixed combustion. However, its heat load is small and it is difficult to meet the cooking requirements of my country. The primary air coefficient of the existing atmospheric gas stove burner is generally 0.4-0.7. The premixed air cannot reach the amount of air required for complete combustion. In addition, various factors require a certain amount of secondary air supplementation. In addition, in order to reduce CO emissions, the secondary air supplementation should be as sufficient as possible. At present, there are various ways to supplement air for gas stove burners, generally including side air intake and bottom air intake. The side air intake method is to open a side air inlet on the side of the mixing chamber, and the external air is supplemented through the side air inlet for secondary air. The bottom air intake method is to open a bottom air inlet on the base, and the air below the gas stove is supplemented through the bottom air inlet for secondary air. Among them, although the side air intake method has the advantages of small air intake resistance and large air intake volume, the existing side air intake burners still have problems. For example, due to the entrainment of the combustion hot air flow, the inner and outer fire covers will draw in secondary air through the lateral air inlet of the mixing chamber. The inner ring has a small heat load and a higher primary air coefficient than the outer ring. Therefore, the entrained secondary air is often excessive, while the secondary air entrained by the middle ring fire hole of the outer ring fire cover is insufficient. In order to reasonably distribute the secondary air and realize sufficient combustion of the inner and outer rings at the same time, further improvements are needed.

[0003] On the other hand, in the actual use of the existing gas stove, since the pot is placed on the pot support for heating, there is a certain space between the pot and the burner. In this way, in addition to being used to heat the pot, a considerable part of the heat energy generated by the combustion of the gas escapes into the surrounding environment, causing energy waste. In order to solve the above problems, some heat-collecting and energy-gathering devices have appeared in China in recent years, such as the "energy-gathering ring for gas stoves and gas stoves with the same" disclosed in Chinese patent CN203404823U. The energy-gathering ring is an energy-saving component surrounding the outer periphery of the burner. For the gas stove using the energy-gathering ring, the lateral secondary air provided to the burner will be further affected due to the obstruction of the energy-gathering ring. In addition, the gas stove using the energy-gathering ring has a lateral air intake for the secondary air replenishment channel. Although the secondary air can be preheated when flowing through the secondary air replenishment channel of the energy-gathering ring, the preheating effect of the secondary air is poor due to the small preheating surface. Summary of the invention

[0004] A technical problem to be solved by the present invention is to provide a stove heat insulation cover capable of providing preheated lateral secondary air to the burner in view of the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a stove heat insulation cover which ensures smooth and sufficient lateral secondary air is provided to the burner.

[0006] The third technical problem to be solved by the present invention is to provide a gas stove using the above stove heat insulation cover in view of the above-mentioned existing technical status.

[0007] The fourth technical problem to be solved by the present invention is to provide a gas stove which can reasonably distribute the secondary air entering through the side of the stove heat insulation cover in view of the above-mentioned existing technical status.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: the heat insulation cover for the stove includes an annular cover body, an annular cavity is formed in the center of the cover body, the cover body is double-layered and has a cavity, and is characterized in that: the cover body is provided with air outlet holes connecting the annular cavity and the cavity at intervals along the circumferential direction on the inner side wall forming the annular cavity, and the cover body is provided with air inlet holes on the outer side wall or the bottom wall for external air to flow into the cavity.

[0009] In order to ensure that the heat insulation cover for stove provides smooth and sufficient lateral secondary air to the burner, the air inlet is connected to an external air supply unit, which can be a blower.

[0010] In order to be able to correspondingly supplement secondary air to the ignition areas of the inner ring fire cover and the outer ring fire cover of the burner, the inner side wall of the cover body has an annular inner step, and the air outlet holes include upper and lower rows of first air outlet holes and second air outlet holes spaced apart, wherein the upper row of first air outlet holes are located on the first wall surface above the step, and the lower row of second air outlet holes are located on the second wall surface below the step. The first air outlet holes more specifically supplement secondary air to the ignition area of ​​the outer ring fire cover, and the second air outlet holes more specifically supplement secondary air to the ignition area of ​​the inner ring fire cover.

[0011] In order for the stove heat insulation cover to better contain overflowing liquid, the upper surface of the step gradually slopes downward from the inside to the outside in the radial direction to form a liquid containing area.

[0012] In order to prevent the inner and outer fire covers from sucking in secondary air through the lateral secondary air supply channel of the heat insulation cover, at least one partition is provided in the liquid storage area, and the partition can divide the liquid storage area into at least two relatively independent spaces. The space separated by the partition can specifically supply air to the lateral secondary air supply channel of the burner, and the first air outlet separated by the partition can better supply secondary air to the fire outlet of the outer ring fire cover accordingly.

[0013] From the perspective of simple installation structure, preferably, the partition comprises two side plates vertically spaced apart, and a gap connecting the annular cavity and the cover body cavity is provided between the two side plates.

[0014] In order to provide directional guidance for the secondary air, reduce the supply resistance of the secondary air to the outer ring flame, and make the secondary air supply more rapid, the top end surface of the first wall between the two side plates protrudes upward, and the top end surface gradually tilts downward from the inside to the outside toward the upper surface of the bottom of the cover body.

[0015] In order to supplement the secondary air to the outer ring fire cover having fire outlet holes inside and outside, the top end surface is provided with third air outlet holes in fluid communication with the cavity at intervals along the circumferential direction on the wall surface adjacent to the annular cavity. The third air outlet holes are more targeted to supplement the inner fire outlet area of ​​the outer ring fire cover.

[0016] In order to effectively preheat the secondary air flowing out of the air outlet of the cover, a vertical annular partition is provided in the cavity of the cover, and a gap is formed between the lower edge of the partition and the lower surface of the bottom of the cover. The partition divides the cavity into an air outlet cavity located inside and a preheating cavity located outside. The preheating cavity contains a preheating channel for preheating the secondary air, and the air inlet of the preheating channel is directly connected to the air inlet hole. The preheating channel is provided with an air outlet fluidly connected to the air inlet hole adjacent to the gap. In order to increase the contact area between the preheating channel and the preheating cavity, the preheating channel is in the shape of a spiral disk.

[0017] In order to buffer the secondary air flowing out of the preheating chamber, the bottom of the air outlet cavity is more convex than the lower surface of the bottom of the cover body, and the air outlet holes are correspondingly arranged in the air outlet cavity.

[0018] In order to better ensure that the heat insulation cover can be placed stably on the liquid tray on the gas stove panel, the lower surface of the bottom of the cover body is provided with feet, and the plane where the bottom of the feet is located is lower than the plane where the bottom of the air outlet cavity is located.

[0019] In order to facilitate supporting the pot, pot feet are fixed on the periphery of the top of the cover.

[0020] In order to solve the second technical problem, the present invention provides a gas stove using the above-mentioned stove heat insulation cover, including a gas stove panel and a burner, wherein the burner includes:

[0021] Pedestal;

[0022] An inner ring fire cover is arranged on the base and forms a central gas mixing chamber between the inner ring fire cover and the base;

[0023] The outer ring fire cover is also arranged on the base, located outside the inner ring fire cover, and forms an outer ring gas mixing chamber with the base; an air supplement cavity is formed between the central gas mixing chamber and the outer ring gas mixing chamber; and a plurality of radial secondary air supplement channels for connecting the air supplement cavity with the outside are also arranged on the base at intervals along the circumferential direction;

[0024] The invention is characterized in that the annular cavity of the heat insulation cover surrounds the burner and is placed on the gas stove panel, and the partitions of the liquid storage area of ​​the cover body are aligned with the secondary air supply channels one by one.

[0025] In view of the particularity of the outer ring fire cover with two rings of fire, the outer ring fire cover comprises an annular body and a main cover plate covering the body, and the body comprises a middle ring area and an outer ring area arranged concentrically;

[0026] The middle ring area is provided with a main fire hole connected to the outer ring mixing chamber and formed at intervals along the circumferential direction; a plurality of bosses protruding from the surface of the main body are provided at intervals along the same edge of the main body on the outer ring area, and the intervals between adjacent bosses form a gap connected to the middle ring area, and the gaps are also aligned with the partitions one by one, and radial main fire grooves are formed on each of the bosses at intervals along the circumferential direction, the second air outlet is connected to the outer wall area of ​​the central mixing chamber via the secondary air supply channel, the third air outlet is connected to the main fire hole in the middle ring area via the gap, and the first air outlet is connected to the main fire groove in the outer ring area. Since the middle ring area of ​​the outer ring fire cover requires a large amount of secondary air, secondary air can be supplemented to the outside of the middle ring area through the first air outlet and the third air outlet located in the two vertical side plates of the partition through the gap between adjacent bosses to ensure sufficient combustion of the middle ring; secondary air is supplemented to the outer ring area of ​​the outer ring fire cover through the first air outlet located outside the two vertical side plates of the partition, and secondary air is supplemented to the outer wall area of ​​the central mixing chamber of the inner ring fire cover through the second air outlet located in the two vertical side plates of the partition through the secondary air supply channel.

[0027] In order to facilitate the positioning of the main cover plate, the middle ring area of ​​the main body has an inner ring portion and an outer ring portion. The top of the inner ring portion is higher than the top of the outer ring portion, and the main fire hole axially penetrates the top surface of the inner ring portion. The main cover plate is located on the outer ring portion and the inner edge is against the outer side of the inner ring portion. The outer edge of the main cover plate cooperates with the main fire groove of the boss to form side fire holes respectively.

[0028] In order to prevent the side fire holes of the outer ring fire cover from escaping from the flame, radial flame stabilizing grooves are formed on each of the bosses at intervals along the circumferential direction. The flame stabilizing grooves are spaced apart from the main fire grooves. The outer edges of the main cover plate cooperate with the flame stabilizing grooves of the bosses to form flame stabilizing holes respectively, and the outer edges of the main cover plate extend downward to form a waterproof eaves covering the side fire holes and above the flame stabilizing holes.

[0029] In order to better supply gas to the outer ring fire cover, at least two through holes for gas to pass through are provided on the horizontal connecting portion between the middle ring area and the outer ring area in the body.

[0030] Furthermore, the base is provided with a central gas channel connected to the central gas mixing chamber and an outer ring gas channel connected to the outer ring gas mixing chamber, the central gas channel is connected to the central ejector pipe, and the outer ring gas channel is connected to the outer ring ejector pipe.

[0031] In order to effectively preheat the air provided by the air supply part entering the heat insulation cover, a part of the preheated secondary air can be diverted to enter the central ejector tube and the outer ring ejector tube to provide the burner with preheated primary air, so as to effectively improve the gas utilization rate. For this purpose, the present invention provides a preferred improvement scheme, the air supply part is located outside the central ejector tube and the outer ring ejector tube, the preheating channel is further provided with a first diversion port separated from the air inlet hole, the cover body is provided with a second diversion port corresponding to the first diversion port, the second diversion port is connected to the air inlet end of the central ejector tube and / or the outer ring ejector tube through a pipeline.

[0032] Compared with the prior art, the advantage of the present invention is that the heat insulation cover is provided with an air inlet for allowing outside air to flow into the heat insulation cover cavity, so that the outside air entering the heat insulation cover can be effectively preheated, and the preheated secondary air can be diverted by the air outlet to provide the burner with preheated secondary air, so as to effectively improve the gas utilization rate. The present invention also provides a gas stove using the above-mentioned heat insulation cover, which can use a partition arranged on the heat insulation cover to independently supplement the secondary air of the inner and outer rings, effectively avoiding the irrational distribution of secondary air such as excess secondary air in the inner ring and insufficient secondary air in the outer ring. The secondary air is forced to be diverted through the partition so that both the inner and outer rings can be fully burned, which is particularly suitable for an outer ring fire cover with two rings of fire. The arrangement of the partition can avoid the mutual influence of the secondary air between the inner ring and the outer ring on the one hand, and can also effectively supplement the secondary air for the one ring fire of the two ring fires of the outer ring fire cover close to the inner ring on the other hand, with accurate positioning, improving the gas combustion efficiency, and at the same time the partition can recycle the heat of the mixing chamber to further preheat the secondary air, which helps to improve the thermal efficiency of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the heat insulation cover for a stove in an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A cross-sectional view of

[0035] Figure 3 It is a schematic diagram of placing a heat insulation cover on a gas stove in an embodiment of the present invention;

[0036] Figure 4 for Figure 3 A cross-sectional view of

[0037] Figure 5 A schematic diagram of the structure of a burner in an embodiment of the present invention;

[0038] Figure 6 for Figure 5 Schematic diagram of the decomposition structure;

[0039] Figure 7Schematic diagram of the structure of the outer ring fire cover body in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings.

[0041] like Figures 1 to 7 As shown, it is the best embodiment of the present invention. The heat insulation cover for stoves in this embodiment is not the heat insulation cover in the prior art. It can be connected to an external air supply unit 8 such as a blower, so that the air provided by the air supply unit 8 entering the heat insulation cover can be effectively preheated, and the preheated secondary air can be diverted by the air outlet to provide the burner with preheated secondary air, so as to effectively improve the gas utilization rate. Specifically, it includes an annular cover body 1, an annular cavity 10 is formed in the center of the cover body 1, the cover body 1 is double-layered and has a cavity 11, the cover body 1 is provided with circumferentially spaced air outlets connecting the annular cavity 10 and the cavity 11, and the cover body 1 is provided with an air inlet (not shown in the figure) on the outer wall 102 for the outside air to flow into the cavity 11, and of course it can also be set on the bottom wall 103. In order to be able to supplement secondary air to the fire outlet area of ​​the inner ring fire cover 6 and the outer ring fire cover 7 of the burner, the inner side wall of the cover body 1 has an annular inner step 14, and the air outlet holes include two upper and lower rows of first air outlet holes 121 and second air outlet holes 131 spaced apart, wherein the upper row of first air outlet holes 121 are located on the first wall surface 12 above the step 14, and the lower row of second air outlet holes 131 are located on the second wall surface 13 below the step, wherein the first air outlet holes 121 are more specifically supplemented with secondary air to the fire outlet area of ​​the outer ring fire cover 7, and the second air outlet holes 131 are more specifically supplemented with secondary air to the fire outlet area of ​​the inner ring fire cover 6. In order for the stove heat insulation cover to better contain overflow, the upper surface of the step 14 gradually slopes downward from the inside to the outside in the radial direction to form a liquid holding area 141.

[0042] In order to prevent the inner and outer fire covers from sucking in secondary air through the lateral secondary air supply channel 51 of the mixing chamber, at least one partition 2 arranged along the circumferential direction is provided in the liquid holding area 141, and the partition 2 can divide the liquid holding area 141 into at least two relatively independent spaces, wherein the space separated by the partition 2 can specifically supply air to the fire outlet area of ​​the inner ring fire cover 6 through the lateral secondary air supply channel 51, and the first air outlet hole 121 separated by the partition 2 can better supplement the secondary air for the fire outlet area of ​​the outer ring fire cover 7 accordingly. From the perspective of easy installation, preferably, the partition 2 includes two side plates arranged vertically at intervals, and a gap 17 is provided between the two side plates to connect the annular cavity 10 and the cavity 11 of the cover body 1. In order to enable the space separated by the partition 2 to have a directional guide effect on the secondary air, reduce the supply resistance of the secondary air to the outer ring flame, and make the secondary air supply more rapid, the top end surface 123 of the first wall 12 between the two side plates protrudes upward, and the top end surface 123 gradually slopes downward from the inside to the outside toward the upper surface 15 of the bottom of the cover body 1. The focus of the present invention is also that the burner in the prior art has an inner ring fire cover 6 and an outer ring fire cover 7. The outer ring fire cover 7 generally has only one ring fire. For the case where the outer ring fire cover 7 has two ring fires, the supplement of secondary air for the one ring fire close to the inner ring of the two ring fires of the outer ring fire cover 7 is particularly critical. For this reason, the top end surface 123 of the first wall surface 12 of the heat insulation cover is provided with third air outlet holes 1231 fluidly connected to the cavity 11 at intervals along the circumferential direction on the wall surface adjacent to the annular cavity 10. The third air outlet holes 1231 can provide targeted secondary air supplement for the one ring fire close to the inner ring in the special structure of the outer ring fire cover 7 with two ring fires. In addition, in order to effectively preheat the secondary air flowing out of the air outlet 31 of the cover body 1, a vertical annular partition 111 is further provided in the cavity 11 of the cover body 1. A gap 17 is formed between the lower edge of the partition 111 and the lower surface 16 of the bottom of the cover body 1. The partition 111 divides the cavity 11 into an air outlet cavity 111 located on the inner side and a preheating cavity 112 located on the outer side. The preheating cavity 112 contains a preheating channel 3 for preheating the secondary air. The air inlet of the preheating channel 3 is directly connected to the air inlet hole, and the preheating channel 3 is provided with an air outlet 31 in fluid communication with the air inlet hole adjacent to the gap 17. In this embodiment, in order to increase the preheating The contact area between the hot channel 3 and the preheating chamber 112, the preheating channel 3 is in a spiral disk shape, and in order to buffer the secondary air flowing out of the preheating chamber 112, the bottom of the air outlet cavity 111 is more protruding than the lower surface 16 of the bottom of the cover body 1, and the air outlet is correspondingly arranged in the air outlet cavity 111. At the same time, in order to better realize that the heat insulation cover can be stably placed on the liquid receiving tray 20 of the gas stove panel 4, the lower surface 16 of the bottom of the cover body 1 is provided with a foot 161, and the plane where the bottom of the foot 161 is located is slightly lower than the plane where the bottom of the air outlet cavity 111 is located, and in order to facilitate the support of the cookware, a pot support foot 18 is fixed on the periphery of the top of the cover body 1.

[0043] like Figure 3As shown, it is a schematic diagram of the heat insulation cover being placed on a gas stove, the gas stove includes a gas stove panel 4 and a burner, wherein the burner includes a base 5, an inner ring fire cover 6 arranged on the base 5, a central air mixing chamber 61 is formed between the inner ring fire cover 6 and the base 5, and an outer ring fire cover 7 is also arranged on the base 5, the outer ring fire cover 7 is located at the periphery of the inner ring fire cover 6, and an outer ring air mixing chamber 71 is formed between the outer ring fire cover 7 and the base 5, and an air supplement chamber 70 is formed between the central air mixing chamber 61 and the outer ring air mixing chamber 71; the base 5 is also provided with a plurality of circumferentially spaced A radial secondary air supply channel 51 is used to connect the air supply cavity 70 with the outside world; the annular cavity 10 of the heat insulation cover surrounds the burner and is placed on the gas stove panel 4, and the space separated by the two vertical side plates of the partition 2 of the liquid filling area 141 of the cover body 1 is aligned one by one with the secondary air supply channel 51, so that the space separated by the partition 2 can specifically supply air to the fire outlet area of ​​the inner ring fire cover 6 through the lateral secondary air supply channel 51, and the first air outlet 121 separated by the partition 2 can better provide secondary air replenishment for the fire outlet area of ​​the outer ring fire cover 7. Specifically, the outer ring fire cover 7 of this embodiment is also relatively special. The outer ring fire cover 7 includes an annular body 72 and a main cover plate 73 covering it. The body 72 includes a middle ring area 721 and an outer ring area 722 arranged concentrically; the middle ring area 721 is provided with main fire holes 7211 connected to the outer ring gas mixing chamber 71 and formed at intervals along the circumferential direction; on the outer ring area 722, a plurality of bosses 7221 protruding from the surface of the body 72 are arranged at intervals along the same edge of the body 72, and adjacent bosses 7221 are arranged at intervals along the same edge of the body 72. The gap between them forms a gap 7222 connected to the middle ring area 721, and the gap 7222 is also aligned with the partition 2 one by one. Radial main fire grooves 7223 are formed on each boss 7221 at intervals along the circumferential direction. The second air outlet 131 is connected to the outer wall area of ​​the central mixing chamber 61 through the secondary air supply channel 51, and the third air outlet 1231 is connected to the main fire hole 7211 in the middle ring area 721 through the gap 7222. The first air outlet 121 is connected to the main fire groove 7223 in the outer ring area 722.The middle ring area 721 of the main body 72 has an inner ring portion 7212 and an outer ring portion 7213. The top of the inner ring portion 7212 is higher than the top of the outer ring portion 7213. The main fire hole 7211 axially penetrates the top surface of the inner ring portion 7212. The main cover plate 73 is located on the outer ring portion 7213 and the inner edge 731 is against the outer side of the inner ring portion 7212. The outer edge 732 of the main cover plate 73 cooperates with the main fire groove 7223 of the boss 7221 to form side fire holes respectively. In order to better produce fire, radial flame stabilizing grooves 7224 are formed at intervals along the circumferential direction on each boss 7221. The flame stabilizing grooves 7224 and the main fire grooves 7223 are arranged at intervals. The outer edge 732 of the plate 73 cooperates with the flame stabilizing groove 7224 of the boss 7221 to form flame stabilizing holes respectively. The size of the outlet formed by the gap 17 between the main fire groove 7223 and the flame stabilizing groove 7224 determines the size of the side fire and the flame stabilizing fire. The outlet size can be determined according to design requirements. At the same time, the groove depths of the main fire groove 7223 and the flame stabilizing groove 7224 can be different, which can form a gap 17 for supplementing secondary air. The outer edge 732 of the main cover plate 73 extends downward to form a waterproof eaves covering the side fire holes and the flame stabilizing holes. Because the gas finally flows out and burns after impacting the waterproof eaves, the airflow velocity is low, which also plays a good flame stabilizing role.

[0044] Since the middle ring area 721 of the outer ring fire cover 7 requires a large amount of secondary air, secondary air can be supplemented to the outside of the middle ring area 721 through the first air outlet 121 and the third air outlet 1231 located in the two vertical side plates of the partition 2 through the gap 7222 between the adjacent bosses 7221 to ensure sufficient combustion of the middle ring; the outer ring area 722 of the outer ring fire cover 7 is supplemented with secondary air through the first air outlet 121 located outside the two vertical side plates of the partition 2, and the outer wall area of ​​the central mixing chamber 61 of the inner ring fire cover 6 is supplemented with secondary air through the second air outlet 131 located in the two vertical side plates of the partition 2 through the secondary air supply channel 51. In order to better supply air to the outer ring fire cover 7, at least two through holes 7231 for gas to pass through are provided on the horizontal connection part 723 connecting the middle ring area 721 and the outer ring area 722 in the main body 72. The base 5 is provided with a central gas channel 52 connected to the central gas mixing chamber 61 and an outer ring gas channel 53 connected to the outer ring gas mixing chamber 71. The central gas channel 52 is connected to the central ejector pipe 521, and the outer ring gas channel 53 is connected to the outer ring ejector pipe 531. Finally, in order to effectively preheat the air provided by the air supply part 8 entering the heat insulation cover, a part of the preheated secondary air can be diverted to enter the central ejector tube 521 and the outer ring ejector tube 531 to provide the burner with preheated primary air, so as to effectively improve the gas utilization rate. It also includes an air supply part 8 located outside the central ejector tube 521 and the outer ring ejector tube 531, the air supply part 8 is connected to the air inlet, and the preheating channel 3 is also provided with a first diversion port (not shown in the figure) separated from the air inlet, and a second diversion port (not shown in the figure) corresponding to the first diversion port is provided on the cover body 1, and the second diversion port is connected to the central ejector tube 521 through the first pipe 81 and to the air inlet end of the outer ring ejector tube 531 through the second pipe 82.

[0045] The specific process is as follows. When the air supply part 8 located below the gas stove panel 4 is working, such as a blower, it first enters the preheating channel 3 arranged in the preheating cavity 112 of the heat insulation cover. The secondary air preheated by the preheating channel 3 of the heat insulation cover can be divided into two paths and enter the air inlet ends of the central ejector tube 521 and the outer ring ejector tube 531 respectively, so as to provide the burner with preheated primary air. The premixed primary air and the gas are distributed and enter the main fire hole 7211, the side fire hole and the flame stabilizing hole of the outer ring fire cover 7 from the outer ring gas channel 53 and flow out. Another path of gas enters the cavity formed by the outer ring wall of the inner ring fire cover 6 from the central gas channel, and then flows out from the inner ring fire hole on the inner ring fire cover 6. The air entering the preheating channel 3 flows out from the outlet hole of the air outlet cavity 111 after being preheated. Among them, the annular cavity 10 of the heat insulation cover surrounds the burner and is placed on the gas stove panel 4, and uses The partition 2 of the liquid holding area 141 is aligned with the secondary air supply channel 51 of the burner one by one, so that the first air outlet 121 and the third air outlet 1231 located in the two vertical side panels of the partition 2 replenish secondary air to the outside of the middle ring area 721 through the gap 7222 between the adjacent bosses 7221 to ensure sufficient combustion of the middle ring; the outer ring area 722 of the outer ring fire cover 7 is replenished with secondary air through the first air outlet 121 located outside the two vertical side panels of the partition 2, and the outer wall area of ​​the central mixing chamber 61 of the inner ring fire cover 6 is replenished with secondary air through the second air outlet 131 located in the two vertical side panels of the partition 2 through the secondary air supply channel 51. The independent air supply channel can effectively avoid the hot air flow after combustion and the high temperature of the burner from sucking the secondary air supplied to the inner ring, thereby avoiding mutual influence of the secondary air between the inner ring and the outer ring.

Claims

1. A heat insulation cover for a stove, comprising an annular cover body (1), wherein an annular cavity (10) is formed in the center of the cover body (1), the cover body (1) is double-layered and has a cavity (11), and is characterized in that: The cover body (1) is provided with air outlet holes for connecting the annular cavity (10) and the cavity (11) at intervals along the circumferential direction on the inner side wall (101) forming the annular cavity (10), and the cover body (1) is provided with air inlet holes for allowing external air to flow into the cavity (11) on the outer side wall (102) or the bottom wall (103); the inner side wall of the cover body (1) has an annular inner step (14), and the air outlet holes include first air outlet holes (121) and second air outlet holes (131) arranged in two rows at intervals, wherein the first air outlet holes (121) in the upper row are located on the first wall surface (12) above the step (14), and the second air outlet holes (131) in the lower row are located on the second wall surface (13) below the step; A vertical annular partition is also provided in the cavity (11) of the cover body (1), and a gap (17) is formed between the lower edge of the partition and the lower surface (16) of the bottom of the cover body (1). The partition divides the cavity (11) into an air outlet cavity located on the inner side and a preheating cavity (112) located on the outer side. The preheating cavity (112) contains a preheating channel (3) for preheating secondary air. The air inlet of the preheating channel (3) is directly connected to the air inlet hole, and the preheating channel (3) is provided with an air outlet (31) adjacent to the gap (17) and in fluid communication with the air inlet hole.

2. The heat insulation cover for stove according to claim 1, characterized in that: The air inlet is connected to an external air supply portion (8).

3. The heat insulation cover for stove according to claim 2, characterized in that: The upper surface of the step (14) gradually slopes downward from the inside to the outside in the radial direction to form a liquid holding area (141).

4. The heat insulation cover for stove according to claim 3, characterized in that: At least one partition (2) is arranged in the liquid holding area (141), and the partition (2) can divide the liquid holding area (141) into at least two relatively independent spaces.

5. The heat insulation cover for stove according to claim 4, characterized in that: The partition (2) comprises two side plates arranged vertically at an interval, and a gap (17) is provided between the two side plates for connecting the annular cavity (10) and the cavity (11) of the cover body (1).

6. The heat insulation cover for stove according to claim 5, characterized in that: The top end surface (123) of the first wall surface (12) between the two side plates protrudes upward, and the top end surface (123) gradually slopes downward from the inside to the outside toward the upper surface (15) at the bottom of the cover body (1).

7. The heat insulation cover for stove according to claim 6, characterized in that: The top end surface (123) is provided with third air outlet holes (1231) which are fluidically connected to the cavity (11) at intervals along the circumferential direction on the wall surface adjacent to the annular cavity (10).

8. The heat insulation cover for stove according to claim 7, characterized in that: The bottom of the air outlet cavity is more convex than the lower surface (16) of the bottom of the cover body (1), and the air outlet holes are correspondingly arranged in the air outlet cavity.

9. The heat insulation cover for stove according to claim 8, characterized in that: The lower surface (16) of the bottom of the cover body (1) is provided with a pad foot (161), and the plane where the bottom of the pad foot (161) is located is lower than the plane where the bottom of the air outlet cavity is located.

10. The heat insulation cover for stove according to claim 1 or 2, characterized in that: A pot support foot (18) is fixed on the periphery of the top of the cover body (1).

11. A gas stove using the stove heat insulation cover according to any one of claims 7 to 9, comprising a gas stove panel (4) and a burner, wherein the burner comprises: Base (5); An inner ring fire cover (6) is arranged on the base (5) and forms a central gas mixing chamber (61) between the inner ring fire cover and the base (5); The outer ring fire cover (7) is also arranged on the base (5), located outside the inner ring fire cover (6), and forms an outer ring air mixing chamber (71) between the inner ring fire cover and the base (5); an air supplement cavity (70) is formed between the central air mixing chamber (61) and the outer ring air mixing chamber (71); and a plurality of radial secondary air supplement channels (51) for connecting the air supplement cavity (70) with the outside are also arranged at intervals along the circumferential direction on the base (5); Features: The annular cavity (10) of the heat insulation cover surrounds the burner and is placed on the gas stove panel (4), and the partitions (2) of the liquid storage area (141) of the cover body (1) are aligned with the secondary air supply channels (51) one by one.

12. The gas stove according to claim 11, characterized in that: The outer ring fire cover (7) comprises an annular body (72) and a main cover plate (73) covering the annular body, wherein the body (72) comprises a middle ring area (721) and an outer ring area (722) which are arranged concentrically; The middle ring area (721) is provided with a main fire hole (7211) connected to the outer ring mixing chamber (71) and formed at intervals along the circumferential direction; on the outer ring area (722), a plurality of bosses protruding from the surface of the main body (72) are provided at intervals along the same edge of the main body (72), and the intervals between adjacent bosses form a notch (7222) connected to the middle ring area (721), and the notches (7222) are also arranged one by one in alignment with the partition (2), and radial main fire grooves (7223) are formed at intervals along the circumferential direction on each of the bosses, the second air outlet (131) is connected to the outer wall area of ​​the central mixing chamber (61) through the secondary air supply channel (51), the third air outlet (1231) is connected to the main fire hole (7211) of the middle ring area (721) through the notch (7222), and the first air outlet (121) is connected to the main fire groove (7223) of the outer ring area (722).

13. The gas stove according to claim 12, characterized in that: The middle ring area (721) of the main body (72) has two parts, an inner ring part (7212) and an outer ring part (7213), the top of the inner ring part (7212) is higher than the top of the outer ring part (7213), the main fire hole (7211) axially penetrates the top surface of the inner ring part (7212), the main cover plate (73) is located on the outer ring part (7213) and the inner edge (731) is against the outer side of the inner ring part (7212), the outer edge (732) of the main cover plate (73) cooperates with the main fire groove (7223) of the boss to form side fire holes.

14. The gas stove according to claim 13, characterized in that: Each of the bosses is formed with radial flame-stabilizing grooves (7224) at intervals along the circumferential direction, and the flame-stabilizing grooves (7224) are arranged at intervals from the main fire grooves (7223). The outer edge (732) of the main cover plate (73) cooperates with the flame-stabilizing grooves (7224) of the bosses to form flame-stabilizing holes respectively, and the outer edge (732) of the main cover plate (73) extends downward to form a waterproof eaves covering the side fire holes and above the flame-stabilizing holes.

15. The gas stove according to claim 13, characterized in that: At least two through holes (7231) for gas to pass through are provided on the horizontal connecting portion (723) between the middle ring area (721) and the outer ring area (722) in the body (72).

16. The gas stove according to any one of claims 11 to 15, characterized in that: The base (5) is provided with a central gas channel (52) connected to the central gas mixing chamber (61) and an outer ring gas channel (53) connected to the outer ring gas mixing chamber (71); the central gas channel (52) is connected to the central ejector pipe (521), and the outer ring gas channel (53) is connected to the outer ring ejector pipe (531).

17. The gas stove according to claim 16, characterized in that: The air supply portion (8) is located outside the central ejector tube (521) and the outer ring ejector tube (531), the preheating channel (3) is further provided with a first diversion port spaced apart from the air inlet hole, the cover body (1) is provided with a second diversion port corresponding to the first diversion port, and the second diversion port is connected to the air inlet end of the central ejector tube (521) and / or the outer ring ejector tube (531) through a pipeline.

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